"I take 1 tablet in the morning and without really noticing any physiological changes, I find myself focusing on tasks and accomplishing those tasks. I never feel jittery. At first I assumed the"... (read full reviews)

"I am a bit sensitive to caffeine. I limit myself to a maximum of 200 mgs per day, so I don't have trouble sleeping at night. I was hoping this product would help me with my focus and concentration. It"... (read full reviews)

"I like this particular brand and can count on quality every time. Guarana delivers just enough caffeine, but without the jitters. I take a capsule or two (depending on how much needs to get done that"... (read full reviews)